Circular sawing machine



(No Model.)

' E. S. COLLINS.

GIRGULAR SAWING MACHINE.

No. 355,589. Patented Jan. 4, 1887.

INVBNTOR: @125 WITNESSES %m ATTORNEYS.

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U IT D STATES PATENT Orrion,

EVERELL S. COLLINS, OF NEBRASKA, PENNSYLVANIA.

CIRCULAR SAWING MACHINE.

SPECIFICATION forming part of Letters Patent No. 355,589, dated January4, 1887.

Application filed August 10, 1886. Serial No. 210,519. (No model.)

1'0 11% whom it may concern:

Be it known that I, EVERELL S. GoLLINs, of Nebraska, in the county ofForest and the State of Pennsylvania, have invented certain new anduseful Improvements in Circular Sawing Machines, of which the followingis a full, clear, and exact description.

The object of myinvention is to provide certain new and usefulimprovements in the circular sawing machine for which LettersPatent No.344,568 were granted to me on the 29th day of June,-1886.

The invention consists of avertically-sliding rod actuating themechanism for raising and elevation of my improvement.

In the Letters Patent above referred to the saw is raised and lowered bythe operator actuating the treadle. In this present invention I raiseand lower the saw automatically from the main driving-shaft, and Iaccomplish this by the devices now to be described.

The circular saw 0 is mounted in precisely the same manner as the oneillustrated and de scribed in my former patent above referred to, and isoperated from the vertically-sliding rod N,'which, however, is notactuated by a treadle, but by the device constituting my presentinvention.

On the rod N is pivotally hung the arm P, having forked arms 1? and Pthrough which passes the shaft Q, carrying a pulley, Q, which is rotatedby a belt, Q",'or other devices from the main driving-shaft. To theupright R of the saw-table S is pivoted the treadle T, provided with aroller or pulley, T, which operates against the upper edge of the arm P,and with a roller or pulley, T, which operates against the outer edge ofthe arm P. A weight, U, is hung on the inner end of the treadle T.

The bell-crank lever M is pivoted at M", and is provided with an angularslot, .M, through which passes a pin, N, secured to the rod N.

The lever M is also provided on its upper end rotary motion is impartedto the shaft Q from the main driving-shaft, and when the operatordesires to move the vertical rod N downward, so as to swing the circularsaw to its former position, he presses slightly with his foot onthe'treadle T, whereby the rolleror pulley T,

acting on the arm P, forces the latter against the shaft Q, whichrotates in the direction of the arrow a. The frictional contact betweenthe rotating shaft Q and the arm P causes the arm Pto move downward,whereby'the vertical rod N also slides downward and elevates the saw 0inthe manner and by the means described in my former patent. As soon asthe operator releases the pressureon the treadle T the weight U, actingon the treadle, disengages the roller or pulley T from the arm P andcauses the roller or pulley T to throw the arm P into frictional contactwith the rotating shaft Q, so that the latter moves the arm P, andconsequently the rod N, upward, and the circular saw 0 is returned toits position of rest below the saw-table G, as shown in the drawing.

Instead of using the weight U, a springmay be employed to accomplish thesame purpose.

An arm or suitable projection is fastened to rod N and projects undertreadle T near T, so that when the saw is lowered-and rod N at itsfullest height the inner end of treadle T is raised enough to throw armP out of 7 contact 0 with rotating shaft Q; or the arm P may be made soshort as to just clear the shaft under above condition, thusaccomplishing the desired result.

Having thus fully described my invention, I

claim as new and desire to secure byLetters Patent l. The! combinationof a vertically-sliding rod operating a mechanism for raising andlowering the saw, with a forked arm pivoted on the said rod, a treadleoperating on the said forked arm, and a rotating shaft actuating thesaid pivoted arm, substantially as rod N, operating the mechanism forraising shown and described. and lowering the saw, and the arm 1?,pivoted 2. The combination, with a rotary shaft, of on the said rod Nand provided with the arms a vertiealiysliding rod, N, operatingthemech- P and P, with the rotating shaft Q and the x5 5 anism for raisingand lowering the saw, a treadle T, provided with the pins or rollers Tforked arm pivoted on the said sliding rod, and Tiand the weightU,substantia11y asshown and means, as described, for throwing the armsand described.

of the said pivoted arm alternatelyin frictional EVERELL S. COLLINS.contact with the said rotating shaft, snbstan- Witnesses: ro tially asshown and described. GEORGE LEWIS,

3. The combination of the verticaliysliding J AMES GILFILLAN.

